Laserfiche WebLink
1 <br />' 28 May 2003 <br /> AGE-NC Project No 95-0173 <br />' Page 4 of 8 <br />' Following sample collection, the samples were properly Iabeled, placed in a covered container and <br /> transported under chain-of-custody to Castle Analytical Laboratory (CAL) in Atwater, California <br /> Each sample was analyzed within 72 hours of collection for TPH-g,BTEX and MTBE in accordance <br /> with EPA Methods 5030/8015M Modified and 8020 <br />' 4.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 30 December 2002, the contaminant Impact to ground water was quantified from the ground water <br /> laboratory data collected on 30 and 31 December 2002 <br /> From field and laboratory data collected at the SVE remediation system between 26 September and <br /> 17 December 2002, AGE determined the average TPH-g concentration, the average flow rate and <br /> calculated the approximate mass and volume of hydrocarbons removed <br /> 4 1 GROUND WATER ELEVATION AND GRADIENT <br />' <br /> During the December 2002 ground water monitoring event depths to ground water ranged between <br /> 29 56 and 32 17 feet below the tops of well casings, ground water elevations were calculated to be <br /> between 20 94 feet(MW-8) and 22 25 feet (MW-5)below mean sea level Ground water elevation <br /> at the site decreased an average 1 01 feet between the September 2002 and the December 2002 <br /> ground water monitoring events <br /> The ground water elevation data for the December 2002 ground water monitoring event is depicted <br /> in Figure 3 Ground water flow direction at the site was Inferred to be toward the northeast at a <br /> gradient of 0 004 ft/ft or less, or approximately 22 feet per mile <br /> 42 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of nineteen ground water samples were submitted to Castle Analytical Laboratory(CAL), <br /> a DHS-certified laboratory,for analysis TPH-g was detected in groundwater samples collected from <br /> wells MW-1 through MW-4,MW-6, MW-9,MW-13 (A-C),AW-1 (A and B)and AW-2 (A and B) <br /> at concentrations as high as 130,000 micrograms per liter(µg/1) in the sample from AW-2A <br /> Various BTEX constituents were detected in ground water samples collected from wells MW-1 <br /> 10 through MW-4, MW-6, MW-13 (A-C), AW-1 (A-B) and AW-2 (A-B) at concentrations as high as <br /> Advanced GeoEnvironmental,Inc <br /> I <br />